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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1837a853a75e0cb8f482424e317add1eb06dbad16afe1dd59a262e12efcb392' 
  AND token = 'e7wz4psN8hFjSUr/Ia0NS6SaEOHMv8/OVQJn8NBGCe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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