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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffda14dd6e5410f06a33a71cbe2f32d12c22ec3ef4bd092e7510e0bf35e8762' 
  AND token = 'H1eoyoeMwHTVS722KXokF1JzrVZRrDLmSptD6UHDSVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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