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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651256d405ef045707fa4b532a997bc45586d021b6152380509e32824695d703' 
  AND token = '9fpSUmF+rUSUmeZsKhMujaW7SkbX8M3FGnems3FoaWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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