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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59c0f19f8ece0f6d91ad248a8d811d1d84d992916d14f49fa2ac3b2e1fe1c5d' 
  AND token = '/pQJg5M1pW19frHLw4OP29OCAb78trr5bqm3BMkZlv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}