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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9979154a2128f20c1d42fcb62fa89505a74a0cacfa2a289a8b984b0d84c759' 
  AND token = 'WiqSYO0+z3r4lMBh8NAt6XOdp2DmLfW28DqOp+JEJCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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