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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f923132679b4128d8802173b7f2dd779b8a9a8cd76897271fa759a0305a608' 
  AND token = 'kIgijLGLgYRZ1r5XcFyfuX89L+2TLEVMyy16E61QpD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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